If the hazard of the occupancy is increasing and therefore requiring sprinkler to be re-calculated or if the existing sprinkler system is being modified in any way that the original design is no longer valid

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Eric

8/24/2017 09:02:32 am

Occupancy change, system modifications, size of renovation. If it is a small renovation (of say 10 sprinklers), no occupancy change and the heads are just relocated one for one (i.e. for spacing purposes or a new ceiling), it may not be worth the calculation. Depends on your comfort level.

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Mark Ma

8/24/2017 09:32:43 am

In all SF bay area cities, if any TI project involve using a flexhead connection in the fire sprinkler system, a hydraulic calculation will be required.

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Bobby

8/24/2017 06:28:15 pm

Calculations required when the sprinkler renovations exceed what the original system was designed for. This includes:
1. If the sprinkler renovations now include numerous "2-fers" (2 sprinklers supplied by one outlet), that were not present before.
2. Additional sprinklers added on existing branch lines, in which it is obvious that a calculation may prove more demanding than the original design.
3. Increase in occupancy hazard classification.

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Nimal Tissa Wijetunga

8/25/2017 04:13:59 am

Hydraulic Calculation is required except Pipe Schedule method.

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Sam

8/25/2017 10:39:58 am

Hydraulic calculations are required due to renovations:
1- change in hazard classification
2- change in hydraulic remote area that may impact the existing pipe sizes, static & residual pressures of an existing sprinkler piping system.

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